/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


/*
 * System clock functions.
 */

#include <sys/time.h>
#include <fcntl.h>
#include <errno.h>

#include <cutils/compiler.h>
#include <utils/SystemClock.h>
#include <utils/Timers.h>

#define LOG_TAG "SystemClock"

#include <utils/Log.h>
namespace android {

/*
 * native public static long uptimeMillis();
 */
    int64_t uptimeMillis() {
        int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
        return (int64_t) nanoseconds_to_milliseconds(when);
    }

/*
 * native public static long elapsedRealtime();
 */
    int64_t elapsedRealtime() {
        return nanoseconds_to_milliseconds(elapsedRealtimeNano());
    }

/*
 * native public static long elapsedRealtimeNano();
 */
    int64_t elapsedRealtimeNano() {
#if defined(__linux__)
        struct timespec ts;
        int err = clock_gettime(CLOCK_BOOTTIME, &ts);
        if (CC_UNLIKELY(err)) {
            // This should never happen, but just in case ...
            ALOGE("clock_gettime(CLOCK_BOOTTIME) failed: %s", strerror(errno));
            return 0;
        }

        return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
#else
        return systemTime(SYSTEM_TIME_MONOTONIC);
#endif
    }

}; // namespace android
